import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';
var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {

    let scene, camera, renderer, radianceMap;

    const COLOR = 0xcccccc;

    function init() {

      const width = window.innerWidth;
      const height = window.innerHeight;
      const aspect = width / height;

      // renderer

      renderer = new THREE.WebGLRenderer( { antialias: true } );
      renderer.setSize( width, height );
      renderer.setPixelRatio( window.devicePixelRatio );
      document.body.appendChild( renderer.domElement );

      window.addEventListener( 'resize', onWindowResize );

      document.body.addEventListener( 'mouseover', function () {

        scene.traverse( function ( child ) {

          if ( child.isMesh ) child.material.color.setHex( 0xffffff );

        } );

        render();

      } );

      document.body.addEventListener( 'mouseout', function () {

        scene.traverse( function ( child ) {

          if ( child.isMesh ) child.material.color.setHex( 0xccccff ); // tinted for visibility

        } );

        render();

      } );

      // scene

      scene = new THREE.Scene();

      // camera
      camera = new THREE.PerspectiveCamera( 40, aspect, 1, 30 );
      camera.position.set( 0, 0, 18 );

    }

    function createObjects() {

      const geometry = new THREE.SphereGeometry( 0.4, 32, 16 );

      for ( let x = 0; x <= 10; x ++ ) {

        for ( let y = 0; y <= 10; y ++ ) {

          const material = new THREE.MeshPhysicalMaterial( {
            roughness: x / 10,
            metalness: y / 10,
            color: 0xffffff,
            envMap: radianceMap,
            envMapIntensity: 1,
            transmission: 0,
            ior: 1.5
          } );

          const mesh = new THREE.Mesh( geometry, material );
          mesh.position.x = x - 5;
          mesh.position.y = 5 - y;
          scene.add( mesh );

        }

      }

    }

    function createEnvironment() {

      const envScene = new THREE.Scene();
      envScene.background = new THREE.Color( COLOR );

      const pmremGenerator = new THREE.PMREMGenerator( renderer );
      radianceMap = pmremGenerator.fromScene( envScene ).texture;
      pmremGenerator.dispose();

      scene.background = envScene.background;

    }

    function onWindowResize() {

      const width = window.innerWidth;
      const height = window.innerHeight;

      camera.aspect = width / height;
      camera.updateProjectionMatrix();

      renderer.setSize( width, height );

      render();

    }

    function render() {

      renderer.render( scene, camera );

    }

    Promise.resolve()
      .then( init )
      .then( createEnvironment )
      .then( createObjects )
      .then( render );

  }
})